GmSSL is a open source cryptography and SSL/TLS library forked from OpenSSL. GmSSL support Chinese cryptography algorithms and standards.

Block Ciphers:

• SM1
• SSF33
• SM4/SMS4
• GM One-Time Password (OTP)
• Combined Public Key (CPK)
• Format-Preserve Encryption (FFX)
• CBC-MAC (compatible with GM standards)

Block Cipher Operation Modes:

• ECB, CBC, CFB, OFB, CTR.
• CCM, GCM, OCB.
• FFX.

Stream Ciphers:

• ZUC
• RC4

Hash Functions:

• SM3
• SHA-1, SHA-2
• Blake2
• MD5
• MDC2

Key Derive Functions (KDF):

• X9.63 KDF
• IBCS (RFC 5094) KDF

MAC:

• CBC-MAC
• HMAC
• CMAC
• GMAC

Public Key Cryptography:

• ECIES (Elliptic Curve Integrated Encryption Scheme)
• SM2 Public Key Encryption
• SM2 Key Agreemetn Protocol
• SM2 Digital Signature Scheme
• SM9 Identity-Based Encryption
• SM9 Identity-Based Sigature Scheme
• SM9 Identity-Based Key Agreement Protocol
• Paillier Encryption with Addition Homomorphism
• CPK (Combined Public Key)

SSL/TLS Protocols:

• GM SSL VPN
• TLS 1.3
• TLS 1.0/1.1/1.2

Cryptographic APIs:

• OpenSSL EVP (Envelop) API
• GM SKF API and SDF API
• Java API through JNI

Hardware Support:

• GM Cryptographic Hardware SKF/SDF
• VIA-Alliance SM3/SM4 Instructions
• Intel AVX2 acceleration for SM4/SMS4